Ok so now I have:

    my $this = {};
    bless( $this );

    my $count = Devel::Leak::NoteSV( $this->{handle} );

       ...application ( too much to list )

    Devel::Leak::CheckSV($this->{handle});
[download]

And in my error_log I'm getting:
new 0xa29e18 :
...
new 0x96f61c :
old (1):
0
new 0xa0fe0c :
...
new 0x9fabe4 :
old (1):
0
new 0x9ffe30 :
...
new 0x96f61c :
old (1):
0
new 0xa00e18 :
...
new 0x96f61c :
old (1):
0


What does the old (1): 0 mean?
Would that be causing the "Attempt to free unreferenced scalar" errors?